Zalman are not known for their fans being particularly quiet, and the Antec 3-speed is really only used if you buy the case that they come with.

I would go for a Scythe DF or a GlobalWin NCB, or a low speed Yate Loon. All are reasonably priced and are pretty darn quiet, especially when undervolted. There are lots of threads where these are discussed.

I realize this is an older post, but I have some info that may be helpful to you or others looking for a replacement for this fan.

I had this fan (NMB-MAT Model 4715KL-04W-B46) in an old compaq proliant 1600r and it died one day. I also searched and found the replacements and prices that you did. I happen to have a spare 1600r and pulled the fan out of it and swapped it. The working fan i pulled was a Nidec Series TA450DC which I was able to order from http://www.xoxide.com/120mm-nidec-fan.html for $14 (for a spare). The server was installed in a rack so I can't tell you if it's any quieter, but it is a heckuva lot cheaper and works with no problems.

Would that make 36.8+36.8 = 73.6 cfm? Or is it not the same as one fan w/ 68.9 cfm?

It's not the same. Two fans installed in series (which is what you are proposing) does not double the airflow, but it will increase static pressure. To double airflow you want to mount the fans in parallel:

Okey.
But I suspect that I will need pretty much air for keeping the new system cool. Shouldn't I go up in rpm to get more cfm (hehe) but without having to run the fans in 12V?
Do you get good airflow from the quieter fans (nexus...)?

Look, there is a trade-off between airflow and noise. More airflow = more noise. You will have to decide which is more important, low temps or low noise. I find a Yate Loon 120mm meets all my cooling needs, but I have cool CPU and integrated graphics.

What makes you think that you need two high-speed 120mm to keep it cool? The fast CPU's these days are relatively cool, and while some of the the GPU's are darn hot -- if you have a good case with low restriction on the air flow, two low speed 120mm fans could be plenty.

If you need more air flow -- you cut out the fan grills, and use wire ones. Also, you use more efficient heatsinks. Going to even medium speed (1600RPM+) 120mm would be way too loud.

One or two 700-900RPM 120mm fans is plenty for almost any system, if the rest of it is set up correctly.

I was in at a local store looking for Nexus fans. And the clerk (which after a good talk I understood that he knew what he was talking about) told me that they had gotten plenty complains about the Nexus (the store sells nationwide). The main was simply that they broke to easy.
He said go with a ball bearing fan instead.

What do you guys say about this?
And how much of the "silence" will I loose if I buy a good ball bearing instead of a Nexus (glide bearing that is??)?

I'm not sure if I've heard of even one complaint about a Nexus fan breaking? Maybe some have, but if it started happening very much, I'm sure that SPCR would be the place that you would hear about it!

Ball bearing fans can last longer, but they can also be noisier. If you want a BB fan, you might try one of the only ones that has a chance of being quiet: Scythe Minebea NMB, which runs at 1100RPM, and they claim 18dBA and 41CFM. It also has 9 blades, instead of the usual 7, which in theory at least, would tend to allow it to push more air at (a low) RPM.

When referring to Papst fans, be sure to be very specific about which model. It isn't enough to say 4412 since there's a range of those with CFM ranging from medium to extra extra low, e.g., I donated a 4412 F/2GLL and 4412 F/2GLLL to SPCR a year ago for testing.

one of my 3 yate loon 120mm fans (the 1600rpm version) recently started making a hell of a noise.

All my fans are attached to a fanmate and run at (estimated) 8v or something like that

They are all a couple of years old (2-3 years) and ran about 70% of the time (so this might be normal wearoff)

Now offcourse I want to replace this hellish noisemaker, so I'm looking around to buy some extra 120mm's

and i noticed some weird things:

in holland the nexus 120mm costs only 6 euro??? which is half of the yate loon 120mm (12 euro)
while according to this forum, the yate loon should be cheaper...

i also saw the post above mentioning that nexus fans brake easily

this scares me a bit off the nexus, although i also know the yate loon isnt perfect either...

personally i do prefer the 1600rpm of the yate loon, as it gives a bit more headroom, but if the nexus would have a longer life + is only half the price, i would like to consider it...

in short: i am doubting

one other thing that i might want to consider is restrictiveness. If I understand it right, I am using them in quite a restrictive environment:

i have a hole in the bottom of my case
on top of that hole is a 1cm thick dustfilter of the thing that sucks air above cooking place
above that filter are 2 yate loon fans sucking air in to the case
and above that is the radiator of my watercooling

does anyone if the nexus handles restrictiveness better then the yate loon at the same rpm?

I would start a new thread in the Fans and Control section, but to go ahead and give you advise I would shy away from any low RPM fans in your case due to your restricted environment, rather restrictive indeed.

Have you considered a "pantyhose" filter? Not sure how bad the dust problem is for you, but that sort does the trick for me. Doesn't work for everyone though; take a look at Bluefront's setups of the the years.

Also, what kind of rad are you using? With few exceptions like the comparatively recent Thermochill and Swiftech rads, rads in and of themselves are rather restrictive so a thick filter just adds to the problem. A pair of Nexus fans on a Thermochill is about as good a SPCR-spec quiet watercooling gets besides passive, but I don't think a YL @ 1k would suffice in your setup. Your setup actually sounds like it could use a nice blower...but that's not exactly on the SPCR side of the quiet scale lol.

I would pickup a couple Scythe S-Flex 1600k SFF21F 120mm fans, but I don't know if they are available in your area of the world.

I tried with the pantyhose first, but it was too hard to install (it always teared apart when i tried it)

that is why i went for the thick filter (which just lays loose on the bottom of my case)

at first, i was also very sceptical about this, and i do think it does block lots of air, but in the end, it didnt seem to matter much in my case

I have a Thermochill PA120.2 Radiator, a Swiftech Storm G4, a Danger Den Maze 4 Acetal and a Danger Den D5 Pump (all quite nice stuff :p)
I tried overclocking my system without all dust filters and all fans and pump @ max speed to find the maximum speed, and then i tried lowering the fans and pump down
and it doesnt seem like temperature is limiting my a64 3200+ @2600Mhz, so in the end i ran the pump @ minimum speed and all fans at very low speed as well

and the temp still remains very low actually

but... I wont be keeping this cpu forever, and my new cpu might be more sensitive to temperature, so i will take your advice and go for the yate loons again to have more headroom with the higher rpm...

Not surprising your temps are OK considering your CPU (assuming you're not overvolting it through the roof). But yeah, if you want to push, say, a QX6600 to 4+GHz you'll be looking at taking things to a whole new level.

In this case personally I would go for the Nexus or better yet a 1200k S-Flex if you can get them, undervolt them as low as your temps will allow, and enjoy the quietness in addition to the OC. Later on when you're ready to lay down a few quid on a new rig, the price of a few additional fans to go with it (should any be needed) should only be a fraction of your purchase.

On the side -- the Storm probably won't perform optimally on any of Intel's "glued" together CPUs. I forget the Barcelona's core dimensions right off, but it may be small enough for the Storm design to shine. Just another bit to think about when upgrade time comes around. Myself, I'm waiting for next-gen vids -- probably will need to go WC just for the vid lol.

I do am overvolting quite a bit (for watercooling at least) but it is not extreme yet (the cpu isnt one of the easiest to overclock :/ )

i can find those s-flex in NL, but they are too expensive (16 euro), for that price i rather buy some nexus (6 euro) or yate loons (12 euro)

I do would like to take these fans over to my next system as well (i have the tendency to buy as much as i can as a long term investment :p) so I'm still thinking about buing some yate loons (although those nexus still remain attractively cheap :p)

You did scare me a bit with your saying that my storm wont do so well with those Intel's
I was hoping my uber expensive and rare (it was one of the last) storm's would be able to freeze my next cpu as well...
This is because the 2 cores are never exactly the same height, right? is there any block that can cool those better then my storm then?

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